ABAP Select data from SAP table P_REFDOC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P_REFDOC table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to P_REFDOC. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the P_REFDOC table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_P_REFDOC TYPE STANDARD TABLE OF P_REFDOC,
      WA_P_REFDOC TYPE P_REFDOC,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <P_REFDOC> TYPE P_REFDOC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P_REFDOC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P_REFDOC
  INTO TABLE IT_P_REFDOC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P_REFDOC
*  INTO TABLE @DATA(IT_P_REFDOC2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_P_REFDOC INDEX 1 INTO DATA(WA_P_REFDOC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P_REFDOC ASSIGNING <P_REFDOC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P_REFDOC>-MANDT = 1.
<P_REFDOC>-PREPAYMENTASSIGNEDDOCUMENTUUID = 1.
<P_REFDOC>-PREPAYMENTCONSUMPTIONDOCUUID = 1.
<P_REFDOC>-SAPBUSINESSOBJECTTYPECODE = 1.
<P_REFDOC>-DOCNUMBER = 1.

ENDLOOP.

LOOP AT IT_P_REFDOC INTO WA_P_REFDOC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P_REFDOC-DOCUMENTITEMNUMBER, sy-vline,
  WA_P_REFDOC-PREPAYMENTAGRMTLINKTYPE, sy-vline,
  WA_P_REFDOC-REFERENCEAPPLICATIONDOCUMENT, sy-vline,
  WA_P_REFDOC-PREPAYMENTAGREEMENTISACTIVE, sy-vline,
  WA_P_REFDOC-PREPAYMENTAGRMTREFLINK, sy-vline,
  WA_P_REFDOC-PREPAYMENTAGRMTREFLINKUUID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P_REFDOC you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_P_REFDOC TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_P_REFDOC INTO WA_P_REFDOC.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_P_REFDOC_STR, 
MANDT TYPE STRING,
PREPAYMENTASSIGNEDDOCUMENTUUID TYPE STRING,
PREPAYMENTCONSUMPTIONDOCUUID TYPE STRING,
SAPBUSINESSOBJECTTYPECODE TYPE STRING,
DOCNUMBER TYPE STRING,
DOCUMENTITEMNUMBER TYPE STRING,
PREPAYMENTAGRMTLINKTYPE TYPE STRING,
REFERENCEAPPLICATIONDOCUMENT TYPE STRING,
PREPAYMENTAGREEMENTISACTIVE TYPE STRING,
PREPAYMENTAGRMTREFLINK TYPE STRING,
PREPAYMENTAGRMTREFLINKUUID TYPE STRING,
PREPAYMENTAGRMTREFBUSOBJECT TYPE STRING,
PREPAYMENTAGRMTREFDOCITEM TYPE STRING,
PREPAYMENTAGRMTREFDOCUMENT TYPE STRING,
PREPAYMENTAGRMTLINKAMOUNT TYPE STRING,
PREPAYMENTAGREEMENTCURRENCY TYPE STRING,
PREPAYAGRMTACCRINTERESTAMOUNT TYPE STRING,
PREPAYAGRMTACCRINTERESTCRCY TYPE STRING,
PREPAYAGRMTVALIDFROMDATETIME TYPE STRING,
PREPAYAGRMTVALIDTODATETIME TYPE STRING,
CREATEDBYUSER TYPE STRING,
CREATIONDATETIME TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P_REFDOC_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_P_REFDOC_STR-MANDT sy-vline 
WA_P_REFDOC_STR-PREPAYMENTASSIGNEDDOCUMENTUUID sy-vline 
WA_P_REFDOC_STR-PREPAYMENTCONSUMPTIONDOCUUID sy-vline 
WA_P_REFDOC_STR-SAPBUSINESSOBJECTTYPECODE sy-vline 
WA_P_REFDOC_STR-DOCNUMBER sy-vline 
WA_P_REFDOC_STR-DOCUMENTITEMNUMBER sy-vline 
WA_P_REFDOC_STR-PREPAYMENTAGRMTLINKTYPE sy-vline 
WA_P_REFDOC_STR-REFERENCEAPPLICATIONDOCUMENT sy-vline 
WA_P_REFDOC_STR-PREPAYMENTAGREEMENTISACTIVE sy-vline 
WA_P_REFDOC_STR-PREPAYMENTAGRMTREFLINK sy-vline 
WA_P_REFDOC_STR-PREPAYMENTAGRMTREFLINKUUID sy-vline 
WA_P_REFDOC_STR-PREPAYMENTAGRMTREFBUSOBJECT sy-vline 
WA_P_REFDOC_STR-PREPAYMENTAGRMTREFDOCITEM sy-vline 
WA_P_REFDOC_STR-PREPAYMENTAGRMTREFDOCUMENT sy-vline 
WA_P_REFDOC_STR-PREPAYMENTAGRMTLINKAMOUNT sy-vline 
WA_P_REFDOC_STR-PREPAYMENTAGREEMENTCURRENCY sy-vline 
WA_P_REFDOC_STR-PREPAYAGRMTACCRINTERESTAMOUNT sy-vline 
WA_P_REFDOC_STR-PREPAYAGRMTACCRINTERESTCRCY sy-vline 
WA_P_REFDOC_STR-PREPAYAGRMTVALIDFROMDATETIME sy-vline 
WA_P_REFDOC_STR-PREPAYAGRMTVALIDTODATETIME sy-vline 
WA_P_REFDOC_STR-CREATEDBYUSER sy-vline 
WA_P_REFDOC_STR-CREATIONDATETIME sy-vline 
WA_P_REFDOC_STR-LASTCHANGEDBYUSER sy-vline 
WA_P_REFDOC_STR-LASTCHANGEDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.